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Crowley's Ridge (also Crowleys Ridge) is a geological formation that rises 250 to 550 feet (170 m) above the alluvial plain of the Mississippi embayment in a 150-mile (240 km) line from southeastern Missouri to the Mississippi River near Helena, Arkansas.
The Mississippi embayment represents a break in what was once a single, continuous mountain range comprising the modern Appalachian range, which runs roughly on a north–south axis along the Atlantic coast of the United States, and the Ouachita range, which runs on a rough east–west axis west of the Mississippi River.
The Marianna Fault is a fault located in the Crowley's Ridge area west of Marianna in eastern Arkansas. [citation needed] The discovery was first announced by seismologists on January 21, 2009. It is separate from the New Madrid seismic zone, [1] which is 100 kilometers (62 mi) to the east. [2]
Crowley's Ridge, the only portion of the Bluff Hills (74a) ecoregion in Arkansas, is a disjunct series of loess-capped hills surrounded by the lower, flatter Mississippi Alluvial Plain (73). Crowley's Ridge, with elevations of up to 500 feet (150 m), is of sufficient height to have trapped wind-blown silt during the Pleistocene Epoch.
Crowley's Ridge — a long ridge and topographic landmark located above & east of the Mississippi embayment, in northeastern Arkansas.. Subcategories.
Periodic extensive glacial outwash from the Ohio River and Mississippi River produced Crowley's Ridge and both the Eastern Lowlands and Western Lowlands. Silt and sand formed loess and dunes. During the last 11,000 years of the Holocene , Arkansas has experienced additional deposition of alluvium due to Mississippi River floods.
It is theorized that Crowley's Ridge in Arkansas was part of the Chickasaw Bluff formation before the previous ice age when the prehistoric courses of the Ohio River and Mississippi River carved a path between the two. Crowley's Ridge has the same composition as the Chickasaw Bluffs and has similar topography.
Morris State Park is a public recreation area consisting of 161 acres (65 ha) in Dunklin County, Missouri.The state park preserves a section of Crowley's Ridge, a unique geologic feature of southeast Missouri and northeast Arkansas.